Just in case someone's still interested: Here's a pcb I did for the Silent Fly’s Sadowsky Preamp schematic on the third page of this thread. I liked the sound a lot better with J201 transistors, drain voltages adjusted to about 4.4 V each. Replace R4 and R7 with trimmers to adjust the voltage. Cheers, Lars

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Hi all, I came across the Yamaha BB604-605 bass service manual with schematic.The preamp has built in NE-1 parametric EQ for midrange control. Original PCB is double sided so I redesigned to single side PCB. I have not built it yet but have plan to do. On my PCB I designed the way that IC's are mounted on track side , but if legs are bent backwards it will fit as normal. If there are interest to make this preamp feel free to use or modify these files. The PCB is drawn on Sprint Layout 6.

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Politics is the art of so plucking the goose as to obtain the most feathers with the least squawking. - R.G. 2011Jeez, she's an ugly bastard, she makes my socks hurt. I hope it's no ones missus here. - Ice-9 2012

bajaman wrote:okay - here are some graphs the first is normalized to all controls flat (mid way)then: full bass boost, full bass cut, full mid boost, full mid cut, full treble boost, and finally full treble cut.enjoy bajaman

Hi, i don't know how to read these grafs on page 5. I'm curious what is center frequencies of these preamp.Thanks for help!